Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 120
Troubleshooting
∗1: Voltage measurement point
∗2: Refer to Pressure Sensor, Pressure / Voltage Characteristics table on P.168.
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
The
relationship
between the *1
VL and low pressure is
normal (see *2) when voltage
is measured between X18A pins
(2) and (3) of outdoor unit
P.C.B. (A1P)
(see *1).
Replace the low pressure sensor.
Connect the low pressure sensor
property and restart system.
NO
NO
Replace the outdoor unit P.C.B.
(A1P).
YES
YES
The low
pressure sensor is
connected to X18A (blue)
of outdoor unit P.C.B.
(A1P).